Teledyne LeCroy QPHY-USB3-Tx-Rx - Manual (Page 32)

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917719 Rev A
At the completion of the Eye Diagram Test the oscilloscope is in the following configuration:
Figure 21 - Oscilloscope Configuration after Eye Diagram Test
Shown on the screen is the Eye Diagram measured while the PUT is transmitting CP0. Also, the compliance mask
is displayed. The parameters that are shown are the Number of Mask Hits, and the Eye Opening.
Figure 22 - Test Report from Eye Diagram Test
Test 1.3.5 SigTest Eye Diagram
The purpose of this test group is to verify that the eye diagram is within the specification limits using the SigTest
DLL provided by the USB-IF and integrated into the oscilloscope soft ware. The test is performed in the same
manner that Test 1.3.4 is performed, with the exception of that the SigTest DLL is used for analysis, not the SDA
II software. For compliance testing the measurements are made after a compliance channel after applying the
reference Continuous Time Linear Equalizer function. The SigTest DLL currently implements the CTLE function,
however, it does not implement the channel emulation. For this reason, the channel emulation is still performed in
Eye Doctor II before the signal is seen by SigTest .